*{
    margin: 0;
    padding: 0;
}
li{
    list-style: none;
}
.focus{
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 375px;
    height: 211px;
    background: pink;
    overflow: hidden;
}
ul{
    width: 1000%;
    margin-left: -100%;
}
li{
    float: left;
    img{
        width: 375px;
        height: 211px;
    }
}
ol{
    position: absolute;
    right: 10px;
    bottom: 10px;
    li{
        margin: 0 3px;
        width: 10px;
        height: 10px;
        border-radius: 5px;
        background: #fff;
        transition: all .5s;
    }
}
.current{
    width: 20px;
}